Well, apache is too nice, I guess. Because underscores aren't RFC compliant in
domain names nor in host names. Fix your DNS entries...
This has already been reported and closed upstream :
http://trac.lighttpd.net/trac/ticket/1089
I have seen that RFC1033 does mention the underscore for DNS zones, so if you
feel like making an argument upstream with it, feel free, but this isn't
something I'll fix only in the package.

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